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the smoothness would make me guess mopane again, but it lacks the clear two-tone color of mopane. try googling some pictures
of driftwood to compare. if it isn't mopane, then my guess would be a piece of malaysian driftwood. however, malaysian driftwood usually has many, many little
cracks and crevices and this piece seems really smooth.

Those pictures are a little too dark for me get get the grain or colour.
Read these to try and narrow down your search.
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c/p

Standard driftwood - The most readily available and most economical kind of driftwood. This wood is commonly found in North America, besides other part of the world. It is the remnants of trunks or branches that are worn by water erosion or sandblasted by wind erosion. Standard driftwood is available in an endless number of shapes and sizes. It floats and can be sunk by two different methods. The first method is letting it soak in the aquarium over time. The length of time a piece of standard driftwood floats depends on the piece of wood. Small pieces can take weeks, larger pieces take months or even years! A much quicker method is to use a piece of slate that has a hole drilled into it for a screw. We recommend a stainless steel screw which won't rust in the aquarium. The screw is simply fit through the hole and then screwed into the wood. You can also use aquarium safe silicone, but you will have to wait for the silicone to cure. Once in the aquarium, the slate can be covered with either rocks or gravel.

African or Savanna Root - This is probably the second most common driftwood available. It is self-sinking, therefore no slate mounting or extending soaking is needed. It does not have the appearance of standard driftwood. Rather, it is gnarly on one side and quite smooth on the other.

African Driftwood - Not to be confused with African Root. African driftwood looks more like standard driftwood but it's self-sinking. It's more intricate in shape and darker than standard driftwood. Pieces can be quite hollow or have a ribbed appearance. African driftwood pieces are typically hundreds of years old. They command a high price when compared to standard driftwood.

Malaysian driftwood - Another self-sinking driftwood. Close in a appearance to standard driftwood, it typically has elongated branches. An excellent choice if you are looking to attach plants like Java Fern to a piece of wood. It is self-sinking.